Helong climate — normals and trends
Helong (China) has a warm-summer humid continental, dry winter climate (Dwb) under the Köppen-Geiger classification. Its mean annual temperature is 3.3 °C and it receives 832 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (19.6 °C on average) and the coldest is January (-15.7 °C). Rainfall peaks in July.
Helong averages 188 frost days, 2 hot days (≥ 30 °C) and 120 rainy days per year.
Helong has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 194 to 182 per year over the period.
The hottest day of the period reached 34.8 °C (on 3 August 2018) and the coldest -37.3 °C (on 4 January 1970).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
HelongJilin
- coords
- 42.54°, 129.00°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
3.3°C
Average daily high
9.1°C
Average daily low
-2.2°C
Annual rainfall
832mm
Sunshine / day
9.1h
Mean relative humidity
70%
Average peak wind
13.9km/h
Seasonal range
35.3°C
Frost days (< 0 °C)
188 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
120 d/yr
Annual snowfall
86.2 cm
Average feels-like high
6.4 °C
Average feels-like low
-5.3 °C
Average peak gust
39.7 km/h
Tropical nights (≥ 20 °C)
2 d/yr
Solar radiation
14.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.60 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
34.8 °C
3 August 2018
Coldest day
-37.3 °C
4 January 1970
Wettest day
136 mm
15 July 1995
Windiest day
38.0 km/h
5 May 1963
Strongest gust
117.4 km/h
13 April 2010
Hottest feels-like
39.4 °C
3 August 2018
Coldest feels-like
-43.0 °C
4 January 1970
Snowiest day
34.2 cm
13 April 2025
Sunniest day
15.0 h
28 June 1941
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -5.9 °C | +3.7 °C | 20 mm | +11 mm |
| Feb | -5.5 °C | +0.4 °C | 3 mm | -11 mm |
| Mar | 4.1 °C | +2.6 °C | 22 mm | -8 mm |
| Apr | 11.9 °C | +1.0 °C | 115 mm | +60 mm |
| May | 18.4 °C | +0.9 °C | 91 mm | -5 mm |
| Jun | 24.6 °C | +3.4 °C | 101 mm | -29 mm |
| Jul | 28.4 °C | +4.1 °C | 108 mm | -63 mm |
| Aug | 25.3 °C | +1.2 °C | 259 mm | +92 mm |
| Sep | 21.9 °C | +2.8 °C | 77 mm | +2 mm |
| Oct | 11.2 °C | -0.5 °C | 36 mm | -7 mm |
| Nov | 4.2 °C | +2.8 °C | 26 mm | -4 mm |
| Dec | -6.2 °C | +1.0 °C | 11 mm | -3 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Helong?
Helong has a warm-summer humid continental, dry winter climate (Köppen Dwb). Over 1940-2025, the average annual temperature is 3.3 °C and it receives 832 mm of precipitation per year.
What is the hottest day ever recorded in Helong?
The hottest day measured in Helong between 1940 and 2025 was 3 August 2018, reaching 34.8 °C.
What is the coldest day in Helong?
The coldest day measured in Helong between 1940 and 2025 was 4 January 1970, at -37.3 °C.
Does it snow in Helong?
Yes. Helong gets on average 86.2 cm of snow per year and has around 188 frost days.
Has the climate of Helong warmed?
Yes: Helong warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Helong?
The wettest day measured in Helong between 1940 and 2025 was 15 July 1995, with 136 mm of rain in 24 hours.
What was the windiest day in Helong?
The windiest day measured in Helong between 1940 and 2025 was 5 May 1963, with winds reaching 38.0 km/h.
What is the warmest month in Helong?
The warmest month in Helong is July (19.6 °C on average); the coldest is January (-15.7 °C).
How much does it rain in Helong?
Helong receives on average 832 mm of precipitation per year, spread over about 120 rainy days.
Is it sunny in Helong?
Helong gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.
What is the biggest single-day snowfall in Helong?
The heaviest 24-hour snowfall measured in Helong between 1940 and 2025 was 13 April 2025, with 34.2 cm.
Are there tropical nights in Helong?
Yes: Helong has on average 2 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Helong?
In Helong, between 1940 and 2025, the highest apparent temperature reached 39.4 °C on 3 August 2018, and the lowest was -43.0 °C on 4 January 1970.
Compare Helong with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Helong